to find : how would we multiply the number 13680347,35702369 and 25692359 with 9 mentally? what is the pattern that emerges?
the trick we apply to find the multiple is by writing 9 as (10-1).
the pattern that emerges is last three digits 1,2 and 3 repeat in a cyclic pattern.
mark me it is
it's an incomplete question
and answer is y(3x-4y)(3x-4y)...