Others Maths Puzzle

Find out the remainder when 25 raised to 26^27 is divided by 7

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Others Other Question

The 444th term of the sequence 1,2,3,10,11,12,13,20,21,22,23,30,31.. the way a person climbs a stair is given by f(n)=n, where n is the nth step he takes and f(n) defines the number of steps he climbs in the nth step. if the person finishes climbing the staircase in his 4th step, find the total number of steps in the stairs?