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Supratim Biswas from DPS RUBY PARK KOLKATA, kolkata

Subject :IMO Class : Class 7

How many pairs of alternate numbers have a difference of 3 in the given series?
641228742153862171413286

A Five
B Two
C Three
D Four

Ans 1:

Aarushi10 Kataria from Modern High School for Girls, kolkata

Class : Class 7

How ? Please explain.

okjnbvfty from mkjhgfcdx, bkgyjthcrgdxf

Class : Class 7

how?

Mayank Dahiya from St.Thomas School, JHAJJAR

Class : Class 9

answer is A