Find the next number in the sequence

1, 2, 6, 21, 88, __?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Decode below rebus
D
N
A
T
S , D

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Take one out and scratch my head, I am now black but once was red. What am I?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?