allery10, x, 30 या तीन संख्या अंकगणिती श्रेढीमध्ये आहेत. x ची किंमत काय आहे?
A15
B25
C22
D20
Answer & Solution
Correct answer: D. 20
अंकगणिती श्रेढीतील तीन पदांपैकी मधले पद हे बाहेरील दोन पदांची सरासरी असते, (10 + 30) / 2 = 20.
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