The number of onto mappings from {a,b,c,d,e,f....,z} to {1,2} is:
OPTIONS:
2²⁶
2²⁶-26
2²⁶-2
26²
26!
PLS EXPLAIN WITH FULL WORKING STEPS

Given that (1+5x)⁴ = 1 + Px + Qx² + Rx³ +..... Find the values of P - 2Q + 3R

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