Question

16 +17+18+19=70. How many such 4 consecutive numbers are there less than 1000 when added gives a sum which is divisible by 10?

Answer 1

for every 10 number starting from 1 there are 2 pair of 4 consecutive number divisible by 2.

so in 1000, there are 100of 10 number

now,then the required no. of 4 consecutive numbers =2×100=200

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