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Number System
by Raja Babu - Tuesday, 24 May 2016, 07:34 PM
  Find the last two digits of 87474.?

Can someone reply the logic of this answer?

Solution:87474 = 87472 ×—872 = (874)118 ×—872 = (69 × 69)118 × 69 (The last two digits of 872 are 69) = 61118 ×— 69 = 81 ×— 69 = 89