Let Cr denote the coefficient of xr in the binomial expansion of (1+x)n,n∈N,0≤r≤n. If Pn=C0−C1+322C2−423C3+…..+n+1(−2)nCn, then the value of n=1∑25P2n1 equals.
Held on 22 Jan 2026 · Verified 6 Jul 2026.
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If the roots of x² - 5x + k = 0 are in the ratio 2:3, then k equals:
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