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riverflowsinyou1

2) A.2=2+3:$2^2$+4:$2^3$................................+100:$2^{99}$
A.2=1+1+1:$2^2$+2:$2^2$+3:$2^3$+1:$2^3$+....................+99:$2^{99}$+1:$2^{99}$
A.2=2,5+a-100:$2^{100}$-1+(1:$2^2$+......................1:$2^{99}$)
A.2=1,5+a-100:$2^{100}$+1:2-1:$2^{99}$
=>A=2-100:$2^{100}$-1:$2^{99}$
 
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