Teaching PSTET Paper 1 & 2 Mock Test 2024 Quantitative Aptitude Algebra Identities

यदि (d + e + f) = 14, (d 2 + e 2 + f 2 ) = 96, तो (de + ef + fd) का मान ज्ञात कीजिए।

1
75
2
25
3
50
4
100
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